/*-
 * Copyright (c) 2012 CTPP Team
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the CTPP Team nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      UnicodeUtils.cpp
 *
 * $CTPP$
 */

#include "UnicodeUtils.hpp"

#include <stdlib.h>

namespace FTSS
{

/**
  @var typedef unsigned int ((*CaseFn)(unsigned int));
*/
typedef UINT_32 ((*CaseFn)(UINT_32));

//
// Make a UTF8 string upper or lowercase
//
static INT_32 ChangeCase(CCHAR_P    szSrc,
                         UINT_64    iSrcLen,
                         CHAR_P const szDst,
			 const UINT_64 iDstMaxLen,
                         UINT_64  & iDstLen,
                         CaseFn     pCaseFn)
{
	if (iSrcLen > iDstMaxLen) { return -3; }
	// Make buffer safe for overflow

	UINT_64  iRealDstLen = 0;
	for(;;)
	{
		UINT_32 iUCS = 0;
		// Convert symbol from UTF8 to UCS
		const INT_32 iCharLen = Unicode::UTF8ToWide(szSrc, iSrcLen, iUCS);
		// Incorrect input character
		if (iCharLen == -1) { return -1; }
		iSrcLen -= iCharLen;

		// Change case
		iUCS = ((*pCaseFn)(iUCS));

		CHAR_P szTMPDst = szDst + iRealDstLen;
		// Convert symbol from UCS to UTF8
		const INT_32 iProcessedCharLen = Unicode::WideToUTF8(iUCS, szTMPDst);
		// Incorrect lowercase character; I hope, this should NEVER happened
		if (iProcessedCharLen == -1) { return -2; }

		// Store processed size
		iRealDstLen += iProcessedCharLen;

		// Exit condotion
		if (iSrcLen == 0) { break; }

		// Check free memory in destination buffer
		if (iRealDstLen == iDstLen) { return -3; }
	}

	iDstLen = iRealDstLen;

return 0;
}

//
// Make a UTF8 string lowercase
//
INT_32 Unicode::Lowercase(CCHAR_P    szSrc,
                          UINT_64    iSrcLen,
                          CHAR_P const szDst,
			  const UINT_64 iDstMaxLen,
                          UINT_64  & iDstLen)
{

return ChangeCase(szSrc, iSrcLen, szDst, iDstMaxLen, iDstLen, CharTable::Lowercase);
}

//
//  Make a UTF8 string uppercase
//
INT_32 Unicode::Uppercase(CCHAR_P    szSrc,
                          UINT_64    iSrcLen,
                          CHAR_P const szDst,
			  const UINT_64 iDstMaxLen,
                          UINT_64  & iDstLen)
{

return ChangeCase(szSrc, iSrcLen, szDst, iDstMaxLen, iDstLen, CharTable::Uppercase);
}

} // namespace MAIL
// End.
